| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | // <iterator> |
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| 10 | |
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| 11 | // class istream_iterator |
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| 12 | |
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| 13 | // istream_iterator(const istream_iterator& x) noexcept(see below); |
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| 14 | |
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| 15 | #include <iterator> |
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| 16 | #include <sstream> |
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| 17 | #include <cassert> |
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| 18 | |
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| 19 | #include "test_macros.h" |
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| 20 | |
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| 21 | // The copy constructor is constexpr in C++11, but that is not easy to test. |
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| 22 | // The comparison of the class is not constexpr so this is only a compile test. |
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| 23 | TEST_CONSTEXPR_CXX14 bool test_constexpr() { |
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| 24 | std::istream_iterator<int> io; |
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| 25 | [[maybe_unused]] std::istream_iterator<int> i = io; |
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| 26 | |
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| 27 | return true; |
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| 28 | } |
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| 29 | |
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| 30 | struct thowing_copy_constructor { |
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| 31 | thowing_copy_constructor() {} |
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| 32 | thowing_copy_constructor(const thowing_copy_constructor&) TEST_NOEXCEPT_FALSE {} |
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| 33 | }; |
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| 34 | |
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| 35 | int main(int, char**) |
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| 36 | { |
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| 37 | { |
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| 38 | std::istream_iterator<int> io; |
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| 39 | std::istream_iterator<int> i = io; |
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| 40 | assert(i == std::istream_iterator<int>()); |
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| 41 | #if TEST_STD_VER >= 11 |
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| 42 | static_assert(std::is_nothrow_copy_constructible<std::istream_iterator<int>>::value, "" ); |
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| 43 | #endif |
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| 44 | } |
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| 45 | { |
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| 46 | std::istream_iterator<thowing_copy_constructor> io; |
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| 47 | std::istream_iterator<thowing_copy_constructor> i = io; |
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| 48 | assert(i == std::istream_iterator<thowing_copy_constructor>()); |
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| 49 | #if TEST_STD_VER >= 11 |
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| 50 | static_assert(!std::is_nothrow_copy_constructible<std::istream_iterator<thowing_copy_constructor>>::value, "" ); |
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| 51 | #endif |
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| 52 | } |
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| 53 | { |
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| 54 | std::istringstream inf(" 1 23" ); |
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| 55 | std::istream_iterator<int> io(inf); |
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| 56 | std::istream_iterator<int> i = io; |
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| 57 | assert(i != std::istream_iterator<int>()); |
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| 58 | int j = 0; |
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| 59 | j = *i; |
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| 60 | assert(j == 1); |
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| 61 | } |
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| 62 | |
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| 63 | #if TEST_STD_VER >= 14 |
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| 64 | static_assert(test_constexpr(), "" ); |
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| 65 | #endif |
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| 66 | |
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| 67 | return 0; |
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| 68 | } |
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| 69 | |
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